Detection of sea-breeze inland penetration in the coastal-urban region using geostationary satellite images

Ferdiansyah, Muhammad Rezza; Inagaki, Atsushi; Kanda, Manabu

doi:10.1016/j.uclim.2020.100586

Cited by 17 publications

(10 citation statements)

References 46 publications

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“…According to Figure 2d, seasonal average 6‐month SPEI values indicate that all BFUs experienced droughts during the 2019–2020 bushfire season with magnitudes ranging from −0.70 to −2.50. The NE, CE, SE, and SW region BFUs experienced lower intensity drought (lower magnitude of negative value), most likely due to occasional sea breeze and erratic rainfall resulting from the pressure difference above sea and land (Curtis, 2019; Rezza Ferdiansyah et al, 2020). The BFUs located in the NO region are associated with higher magnitude (greater negative value) (intense) drought.…”

Section: Resultsmentioning

confidence: 99%

Causes of the Widespread 2019–2020 Australian Bushfire Season

et al. 2020

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The recent bushfires (2019-2020) in New South Wales (NSW) Australia were catastrophic by claiming human and animal lives, affecting ecosystems, destroying infrastructure, and more. Recent studies have investigated relationships between hydroclimatic signals and past bushfires, and very recently, a few commentary papers claimed drought and fuel moisture content as the probable causes for the widespread 2019-2020 bushfires. Therefore, in this study, a novel work of encompassing a wide range of factors attributing to the recent bushfires is presented. Empirical evidence-based statistical methods are used to identify the hydroclimatic variables and geomorphic characteristics contributing to the 2019-2020 bushfires. The results highlight that ongoing drought, surface soil moisture (SSM), wind speed (WS10), relative humidity (RH), heat waves (HW), dead and live fuel moisture, and certain land cover types create favorable conditions for fire ignition and aid in fire propagation in different regions of the NSW state. The findings suggest that accounting for the above-identified variables in bushfire prediction and monitoring system are crucial in avoiding such catastrophes in the future. The overarching application of this study is developing robust and more versatile fire protection planning and management. Plain Language Summary Since the 2019-2020 Australian bushfires were catastrophic in terms of burnt area and severity, a detailed analysis of the primary causes is crucial. In this paper, several probable causes are tested statistically to establish their relationship with the burnt area. The results indicate that the ongoing drought, surface soil moisture, wind speed, relative humidity, heat waves, dead and live fuel moisture, and land cover with certain vegetation (particularly native eucalyptus and grazing land) are the primary causes of the widespread bushfire. These results are extremely critical in updating the current bushfire planning and management.

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Section: Resultsmentioning

confidence: 99%

Causes of the Widespread 2019–2020 Australian Bushfire Season

et al. 2020

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“…Averaged topographical slope of Jakarta is less than 1.9 m · km −1 in the inland direction (Badan Informasi Geospasial, 2018), thus can be considered almost flat. Along Jakarta Bay's coast, sea‐breeze‐associated‐cloud‐line was observed moving in similar speed, at least before reaching city centre (Ferdiansyah et al, 2020). On the other hand, surface friction induced by urban roughness elements, such as buildings, structures, and trees, may have more effect on V SBF .…”

Section: Discussionmentioning

confidence: 95%

“…Front intrusion onset was indicated by a sharp change in wind direction, accompanied by a rapid increase in humidity. Similar methods have been used in several previous studies (e.g., Ferdiansyah et al, 2020;Hadi et al, 2002;Jayakrishnan et al, 2021;Reddy et al, 2021). Because the Jakarta coastline runs in the east-west direction, we assumed that the sea breeze mainly blows from north (sea) to south (land).…”

Section: Meridional Wind Variation and Sea Breeze Identificationmentioning

confidence: 99%

“…Merge between sea breeze front and UHI upward flow might slow sea breeze propagation over Jakarta's urban core area. Previous studies showed that sea-breeze-associated-cloud-lines move faster in the west and east sides of Jakarta when reaching urban core area and stagnant clouds were observed over the city center (Ferdiansyah et al, 2020). In the estimation of V SBF using Equation (3), we assumed that the UHI contribution is included in ΔT LLH-KKP .…”

Section: Influence Of Urban Area To Seasonal Sea Breeze Variationmentioning

confidence: 99%

“…On the other hand, urban area and urban development in Jakarta may change the sea breeze. A recent study suggests that the UHI may be causing the delay of sea breeze propagation over Jakarta (Ferdiansyah et al, 2020), and such change could affect the timing and strength of convective storm (Robinson et al, 2013). Numerical simulation by Argüeso et al (2016) has shown that the existence of the city of Jakarta will enhance sea breeze circulations, increase near-surface moisture flux convergence, and lead to an increase of precipitation.…”

Section: Introductionmentioning

confidence: 99%

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Seasonal sea breeze variation analysis based on multi‐year near‐surface observations in Jakarta, Indonesia

Junnaedhi

Inagaki

Ferdiansyah

et al. 2023

Intl Journal of Climatology

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In this study, multi‐year near‐surface observations were conducted at two sites in Jakarta, Indonesia to analyse seasonal sea breeze variation. Seasonal length was defined using observed zonal wind components, the rainy season was defined as December–March, and the dry season was defined as May–September. We found that the sea breeze in Jakarta started earlier, propagated more rapidly, and lasted for a shorter period of time during the rainy than dry season. Variation in the air temperature difference between urban and coastal areas of Jakarta was the major factor driving sea breeze seasonal variation. During the rainy season, night‐time cloud downwelling decreased this air temperature difference, causing earlier sea breeze onset and more rapid sea breeze propagation due to a weaker land breeze. By contrast, during the dry season, intense night‐time radiative cooling inland caused a strong negative temperature difference that produced a stronger land breeze, thus, slowing sea breeze propagation. Seasonal differences in urban surface heating and urban heat island circulation may also affect sea breeze onset and propagation speed. Discrepancies in thermal properties between urban core and coastal areas of Jakarta also prolonged positive temperature differences after sunset, thus extending the sea breeze duration in the dry season.

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Role of updraft in dry‐season torrential rainfall in Greater Jakarta, Indonesia

Handayani

Permana

Isoda

2023

Atmospheric Science Letters

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Coastal urban areas in tropical regions, such as Greater Jakarta (GJ) in Indonesia, are susceptible to flood hazards from torrential rainfall. Efforts to understand the convective mechanisms leading to this type of rainfall have been carried out extensively, especially for events occurring in the wet season. However, hydrometeorological risks persist even in the dry season, when the rainfall is more closely correlated with the diurnal wind circulation. Among the aspects of convective activities and this diurnal circulation, the details of the updraft remain the least studied and open for discussion. We investigate the role of the updraft in urban torrential rainfall over GJ, using data from a C‐band Doppler radar and reanalysis dataset during the dry season of 2018–2019. Employing back‐trajectory calculations, we locate updraft origins corresponding to the peak of daytime inland rainfall. Most updraft origins are localized at an NW–SE‐oriented front nearly parallel to the coastline on the low‐lying plain, suggesting a region of atmospheric destabilization favorable for convective activity. The dry‐season torrential rainfall over GJ may involve convective activity from this front, that from earlier updrafts originating above the densely populated area, and further enhancement coming from orographic contributions. Our findings suggest the important role of updrafts in the rainfall generation, providing insights into the convective mechanism over GJ.

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Detection of sea-breeze inland penetration in the coastal-urban region using geostationary satellite images

Cited by 17 publications

References 46 publications

Causes of the Widespread 2019–2020 Australian Bushfire Season

Causes of the Widespread 2019–2020 Australian Bushfire Season

Seasonal sea breeze variation analysis based on multi‐year near‐surface observations in Jakarta, Indonesia

Role of updraft in dry‐season torrential rainfall in Greater Jakarta, Indonesia

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